4U only turning into Mametchi?

I am having trouble completing my tamatomo because my character only ever turns into mametchi. So far I have had Lovelin and Melody, then 4 boys in a row, all Mametchi. To try for Kuchipatchi, I used the sweets background, only fed him rice and candy from the kitchen, and played with the frying pan only for 3 days. He weighed almost 90lbs and STILL turned into Mametchi. The only other thing I can think of is that I had no care misses, however, that shouldn't affect most of the male characters.

What should I do? Does any one else have any ideas? It's getting frustrating.

*Topic moved to 'Help for New Tamagotchi Pet Owners'*